Playboy Playmates Karissa & Kristina Shannon are about to take their relationship to a whole new level because the twin sisters have signed on for an extremely lucrative deal in porn.

The Shannon twins rep tells The Blast they just signed a seven-figure deal with Brazzers, one of the biggest pornography companies in the business.

The centerfolds, who once both dated Hugh Hefner, tell us Brazzers had approached them with the idea of shooting porn, and after mulling it over, they decided to sign on. We’re told there was extensive negotiating going on before the sisters locked down their lucrative deal.

We’re told shooting dates have already been set, and everyone involved is very excited. As for the type of scenes, we’re told the girls will be shooting boy/girl, girl/girl, boy/girl/girl and all-girl group, and will be appearing in the same scenes together.

We’re told the scenes will all be “tastefully done,” and abide by all the rules and regulations to avoid any issues with siblings being featured together on camera.

The twins, who also starred on the reality show, “The Girls Next Door,” tell us, “Hef would be proud that we are reinventing ourselves just like he had done throughout his legacy!” They added, “There’s no doubt we are the closest twins on the planet!”

They are also very excited, “to finally share with everyone that we are complete f*cking monsters in the bedroom and exclusively with the best … Brazzers!”

Along with the new career move comes new responsibilities, so we’re told both Shannon twins are currently in the process of insuring their butts for $1 million dollars each.